I have been experimenting with this framework and like it. I have been managing a lage project that is using Prado and am thinking that once we complete the next phase, we are going to experiment with Yii and look to possibly starting a rewrite if the performance is as good when we compare our Prado app to it.
Separately I have a small desktop app that I want to rewrite in PHP and will use PHP and Yii to do it. AS I make progress over the coming weeks I will post a link to it (including the code) here so others can share in the experience and possibly comment. The database I will use will be mysql , though I use Firebird mostly and recently Postgres with the Prado project I mentioned.
